I have a user who is visually restricted: she cannot see red, thus she has to highlight any red text to be able to read it.

I don't think that's acceptable, so I would like to replace all red fonts in the entire site with another colour. It shouldn't affect normal users - only ones with sight difficulties, for whom there is a different stylesheet with bigger font sizes.

It wouldn't normally be a problem, as I could change the classes which contain red as a font colour, except the same stylesheet applies to a forum, where users can choose their own font colours.

Since I believe nothing is impossible, I know it's possible to replace the colour of these posts in the forum, but I haven't a clue how... (Or would you like to disillusion me?)

I would have to say use a style sheet switcher if you want some sort of solution. Just add a new style sheet with the changed CSS, and provide a button for her to switch the style.

But if you are talking about one user, maybe right a tutorial for the user that explains how to change the browser user style. If he/she can't red on your site, they can't see red on any other site. The user really needs to change their user style.

User style? Pardon my thickness, but what's that?

The alternative stylesheet is part of the development, but since a forum (which will probably use <font> tags!!) is involved, I would like to replace the colour attribute in posts if possible.

Yes, it's one user, who knows 10 other users who probably has the same problem (who knows 10 other users...). I don't want them to have to do something they don't need to have to do. The site should display right for their difficulties without their chaning anything beside the stylesheet, if at all possible.

Red and neon colours simply is a problem for some people. People who I never thought would join our group, but since they have, I think it's only fair to cater for them.

The philosophy: People are inherently lazy, so the easier I can make it for them to access information they may want, the better for me and them.

If user style is the answer, then by all means I would provide a tutorial, once I find out what it is. At the moment the only solution she has is to highlight any red text, which displays white on black. If I had problems reading red, I simply wouldn't bother, honestly. I would expect the webmaster to cater for me (but then I'm a very demanding customer...)

What is your message board powered by? (XMB, SMB, VMB)

XMB, SMB, VMB? Am I getting old not knowing what these mean?

I use PHPBB (not by choice) if that helps.

Well I don't know PHP, but if you do, you can use a string replace function immediately before rendering a forum page. Swap out color="red" and color='red' and color=red and style="color:red", or if you're brave just all occurances of the word red for something else.

Thanks Croce That sounds like a brilliant idea. I will look into it for sure. (Thus starts my PHP education.)